Original catalogue drawing - Timken TRB Catalog, page 578
Scanned from the manufacturer catalogue page listing this part number. All part numbers printed on that table share the same drawing.
Scale cross-section
Blue = inner / outer ring, yellow = rolling element. Drawn to scale from this part's own
dimensions for selection reference only - not a manufacturing or assembly drawing.
Dimension table (mm / inch)
Symbol
Dimension
mm
inch
d
Bore diameter
254
10
D
Outside diameter
323.85
12.75
T
Overall assembly width
63.5
2.5
C
Cup / outer-ring width
50.8
2
r
Chamfer (min)
0.8
0.0315
Notes
Tapered roller bearings are cone / cup assemblies; cone and cup weights are listed separately and the total is their sum. Weights are given in kg. Load ratings are shown in both the original catalogue units and the converted value (1 N = 0.2248 lbf). Data is provided for selection reference only - confirm against the latest official catalogue before ordering.
Main dimensions
Bore d (mm)
254.000
Bore d (in)
10.0000
Outside dia. D (mm)
323.850
Outside dia. D (in)
12.7500
Overall width T (mm)
63.500
Overall width T (in)
2.5000
Cup width C (mm)
50.800
Cup width C (in)
2.0000
Load ratings & speeds
Basic dynamic load rating Cr (lbs)
59100
Basic dynamic load rating Cr (N)
263000
Dynamic rating C1 (N, ISO)
263000
Dynamic rating C1 (lbf, ISO)
59100
Radial rating C90 (N)
39200
Radial rating C90 (lbf)
8800
Thrust rating Ca90 (N)
23200
Thrust rating Ca90 (lbf)
5220
Factor e
0.35
Factor Y1
1.95
Factor Y2
2.90
Factor K
1.69
Geometry factor G1
906.8
Geometry factor G2
658.2
Geometry factor Cg
0.1567
Weight
Weight (kg)
11.05
Mounting dimensions (fillets / shoulders)
Shaft fillet R max (mm)
1.5
Housing fillet r max (mm)
0.8
Shaft shoulder db (mm)
267.0
Housing shoulder Da (mm)
312.0
Bearing life (ISO 281 basic rating life)
C / P
Equivalent load P (N)
L10 (106 rev)
L10h at 500 rpm
4
65,750
102
3,386
6
43,833
392
13,083
8
32,875
1,024
34,133
10
26,300
2,154
71,814
15
17,533
8,323
277,449
Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 263,000 N. Hours = L10 x 106 / (60n). Life-modification factors for lubrication, contamination and temperature (aISO) are not included.
Source & traceability
Brand
Timken
Source catalogue
Timken Tapered Roller Bearing Catalog (2016)
Catalogue page
p.578 (dimensions)
Series type
TDO
ISO dynamic rating C1, Timken C90 / Ca90, static rating C0, geometry factors and assembly weight.
Send us the quantity you need and we will come back with price and
lead time, normally within 24 hours. Equivalent parts from other brands can be quoted at the same time.
